CN107093903A - A kind of utilization STATCOM improves the control method of HVDC alternating current filter switching performances - Google Patents
A kind of utilization STATCOM improves the control method of HVDC alternating current filter switching performances Download PDFInfo
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- CN107093903A CN107093903A CN201710504098.8A CN201710504098A CN107093903A CN 107093903 A CN107093903 A CN 107093903A CN 201710504098 A CN201710504098 A CN 201710504098A CN 107093903 A CN107093903 A CN 107093903A
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- Prior art keywords
- statcom
- alternating current
- current filter
- filter
- voltage
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Electrical Variables (AREA)
Abstract
In D.C. high voltage transmission alternating current filter and STATCOM engagement process, voltage pulsation problem during alternating current filter switching is not solved still.The present invention proposes a kind of additional coordination control strategy of the adaptive strain referenced reactive current values of STATCOM, variable parameters PI control thought optimal control characteristic is utilized simultaneously, improve the purpose of DC transmission system runnability to improve transient voltage fluctuation and suppress AC filter continual on-off, and then reach.
Description
Technical field
The invention belongs to high-voltage dc transmission electrical domain, and in particular to utilize STATCOM (STATCOM) to one kind
Coordination control is carried out with alternating current filter, to improve the side of the voltage pulsation during AC filter continual on-off and switching
Method.
Background technology
D.C. high voltage transmission (HVDC) is so that its transmission capacity is big, circuit low cost, in the absence of stability limit, can be achieved it is asynchronous
The advantages of networking, as remote, bulk power transmission first choice, weight is made to solve the uneven problem of China's energy, power load distributing
Contribute.
In HVDC system operations, transimission power it occur frequently that change, cause AC filter continual on-off, cut down
Service life of equipment, causes harmonic wave to impact system, causes system oscillation.Also, wave filter belongs to the idle benefit of discrete type in itself
Repay equipment, idle Spline smoothing can be caused in switching, causes voltage jump, give equipment increase extra-stress, to equipment and
System is unfavorable safely.
STATCOM and alternating current filter cooperation mechanism are relatively simple in real engineering, and are thrown for alternating current filter
The voltage pulsation of moment this problem is cut not yet to solve.Therefore, it is further to lift alternating current filter in switching moment to voltage
Rejection ability, reduce its action frequency, reduce equipment loss, seek more superior STATCOM and coordinate with alternating current filter
Cooperation mechanism is particularly important.
The content of the invention
For AC filter continual on-off in improvement D.C. high voltage transmission and the voltage jump problem during switching, sheet
Invention, which is proposed, improves the method for alternating current filter switching performance using STATCOM, and this method can not only effectively reduce wave filter
Action frequency, reduces equipment loss, also can effective rejects trap switching process voltage jump phenomenon.
The technical scheme is that：When System Reactive Power changes, STATCOM is first acted, to suppress voltage pulsation, is reduced
The action frequency of conventional reactive power compensator；And after idle change exceeds STATCOM compensation range certain values, wave filter action
So that STATCOM has more abundant compensation ability, to tackle ensuing idle change；And in alternating current filter switching,
According to the no-power vacancy level of wave filter switching moment system, refer in the STATCOM reactive currents for determining alternating voltage control output
Superposition additional components in good time are made in value, so as to send or absorb according to STATCOM is more increased or decreased in the operating mode short time
It is idle.
Variable parameters PI control thought is utilized simultaneously, i.e., when voltage pulsation is larger, scaling up gain coefficient reduces integration
Gain coefficient, to obtain faster response speed, reduces system overshoot；And when system is in stable state, reduce proportional gain system
Number, increases integration gain factor, maintains the stabilization of system.
The invention provides a kind of method that utilization STATCOM improves alternating current filter switching performance, this method includes tool
The design procedure of body and comprehensive emulation experiment condition, can effectively suppress alternating current filter action frequency and system voltage change,
Especially the voltage jump phenomenon of alternating current filter switching moment, higher with Practical Project approach degree.
Brief description of the drawings
Fig. 1 is the HVDC transmission system topological diagram containing STATCOM；
Fig. 2 is STATCOM voltage double-closed-loop control figures；
Fig. 3 is STATCOM and alternating current filter additional coordination control block diagram；
When Fig. 4 is that alternating current filter is cut off, no additional control and each electrical quantity waveform pair of different system containing additional control
Than figure；
When Fig. 5 is that alternating current filter is put into, no additional control and each electrical quantity comparison of wave shape figure containing additional control.
In Fig. 2, Uac *、UacRespectively ac bus voltage instruction value and actual value, Uc *With UcIt is straight for each H bridges of STATCOM
Flow side voltage instruction value and actual value；Iq *、IqRespectively referenced reactive current value and actual value；Id *And IdRespectively watt current
Command value and actual value；UgdAnd UgqRespectively alternating voltage is active and reactive component；Ud_refAnd Uq_refRespectively final output is handed over
Flow that voltage is active and reactive component command value；Sa、Sb、ScFor final output three-phase pulse control signal.
In Fig. 3, Uac *、UacRespectively ac bus voltage instruction value and actual value；ΔI1With Δ I2For wave filter switching
Before, the large and small extra current peak value of unbalanced value that reaction system is idle, and peak value size is with the change of System Reactive Power unbalanced value
Change；K1For switching signal, put into as 1, cut off as -1；T1、T2For integration time constant；T3Postpone what is eliminated for additional control
Time constant, additional control is gradually removed after starting and postponing the duration, to increase STATCOM adjustable range and prevent
Long-time overload；Iq *It is to determine alternating voltage control output referenced reactive current value, Iq1 *It is output referenced reactive current value.
Embodiment
The embodiment of the present invention is described in detail presently in connection with drawings and examples, but the present invention is not by described reality
Example is applied to be limited.
Step is as follows：
1) by taking certain domestic ± 800kV direct current transportation Practical Project as an example, the D.C. high voltage transmission mould containing STATCOM is built
Type, as shown in Figure 1；
2) alternating current filter operating dead zone and the stagnant common 210Mvar of ring scope are set, and bring STATCOM into ac filters
In device control strategy；
3) when System Reactive Power changes, STATCOM is first acted, to suppress voltage pulsation, reduces conventional reactive power compensator
Action frequency；And after System Reactive Power change exceeds STATCOM compensation range certain values, wave filter is acted so that STATCOM
With more abundant compensation ability, to tackle ensuing idle change.Shown in specific formula such as formula (1) (2).
When the formula that meets (1), an alternating current filter group is cut off：
Qdc-Qfilter≤Qac-QDead band-Qmargin-Qs (1)
When the formula that meets (2), an alternating current filter group is put into：
Qdc-Qfilter≥Qac+QDead band+Qmargin+Qs (2)
In formula (1) (2)：QdcFor the idle of transverter consumption；QfilterNow to have put into the capacity of alternating current filter；Qac
It is uneven idle for the ideal of setting, it is mostly 0 in engineering；QDead bandIt is generally single for preventing alternating current filter frequent movement
0.7 times of alternating current filter group nominal reactive capacity；QmarginIt is the Reactive Power Margin set by the stagnant ring of consideration system, typically sets
For 20% or so of single group alternating current filter rated capacity.
4) the additional control block diagram shown in design drawing 3, according to the no-power vacancy level of alternating current filter switching moment system,
Determine to be superimposed additional components in good time in the referenced reactive current value of alternating voltage control output in STATCOM, so that short according to operating mode
STATCOM is more increased or decreased in time to send or absorb idle.Variable parameters PI control thought is utilized simultaneously, that is, works as voltage
When fluctuating larger, scaling up gain coefficient reduces integration gain factor, to obtain faster response speed, reduces system and surpasses
Adjust；And when system is in stable state, proportional gain factor is reduced, increase integration gain factor, maintain the stabilization of system.
Method proposed by the present invention is used it can be seen from Fig. 4 and Fig. 5, i.e., by adding containing additional control
STATCOM, voltage pulsation can be more preferably suppressed than existing control program, reduce filter continual on-off, improve system transient modelling performance,
The normal table of direct current transportation is conducive to run.
Claims (3)
1. a kind of improve the method for alternating current filter switching performance in high voltage direct current transmission project, by STATCOM with exchanging filter
Ripple device cooperation, and additional control is added, to suppress the voltage pulsation during AC filter continual on-off and switching.
2. control method for coordinating according to claim 1, it is characterized in that：When System Reactive Power changes, STATCOM is first moved
Make, to suppress voltage pulsation, reduce the action frequency of conventional reactive power compensator；And when idle work variable quantity is mended beyond STATCOM
Repay after scope certain value, alternating current filter is acted so that STATCOM has more abundant compensation ability, to tackle ensuing nothing
Work(changes.
3. control method for coordinating according to claim 1, it is characterized in that：According to the nothing of alternating current filter switching moment system
Work(vacancy level, determines to be superimposed additional components in good time in the referenced reactive current value of alternating voltage control output in STATCOM, so that
Send according to STATCOM is more increased or decreased in the operating mode short time or absorb idle.Thought simultaneously using variable parameters PI control
Think, i.e., when voltage pulsation is larger, scaling up gain coefficient reduces integration gain factor, to obtain faster response speed,
Reduce system overshoot；And when system is in stable state, proportional gain factor is reduced, increase integration gain factor, maintain system steady
It is fixed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710504098.8A CN107093903A (en) | 2017-06-28 | 2017-06-28 | A kind of utilization STATCOM improves the control method of HVDC alternating current filter switching performances |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710504098.8A CN107093903A (en) | 2017-06-28 | 2017-06-28 | A kind of utilization STATCOM improves the control method of HVDC alternating current filter switching performances |
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| Publication Number | Publication Date |
|---|---|
| CN107093903A true CN107093903A (en) | 2017-08-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710504098.8A Pending CN107093903A (en) | 2017-06-28 | 2017-06-28 | A kind of utilization STATCOM improves the control method of HVDC alternating current filter switching performances |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101202445A (en) * | 2007-12-21 | 2008-06-18 | 华北电力大学 | Method for double feed-in d.c. power transmission |
| KR20120058021A (en) * | 2010-11-29 | 2012-06-07 | 한국전력공사 | Control device for reactive power compansator of hvdc system and hvdc system having the same |
| CN103390898A (en) * | 2013-07-08 | 2013-11-13 | 东南大学 | Dynamic reactive power compensation controller based on instant sequence component power |
| CN104319781A (en) * | 2014-11-17 | 2015-01-28 | 国家电网公司 | On-line voltage stabilization regulation method involving VSC-HVDC power grid |
| CN106786724A (en) * | 2017-01-23 | 2017-05-31 | 浙江大学 | A kind of control strategy of many times MMC HVDC feed-ins pole light current net |
-
2017
- 2017-06-28 CN CN201710504098.8A patent/CN107093903A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101202445A (en) * | 2007-12-21 | 2008-06-18 | 华北电力大学 | Method for double feed-in d.c. power transmission |
| KR20120058021A (en) * | 2010-11-29 | 2012-06-07 | 한국전력공사 | Control device for reactive power compansator of hvdc system and hvdc system having the same |
| CN103390898A (en) * | 2013-07-08 | 2013-11-13 | 东南大学 | Dynamic reactive power compensation controller based on instant sequence component power |
| CN104319781A (en) * | 2014-11-17 | 2015-01-28 | 国家电网公司 | On-line voltage stabilization regulation method involving VSC-HVDC power grid |
| CN106786724A (en) * | 2017-01-23 | 2017-05-31 | 浙江大学 | A kind of control strategy of many times MMC HVDC feed-ins pole light current net |
Non-Patent Citations (1)
| Title |
|---|
| 倪俊强: "HVDC与STATCOM的协调控制策略研究", 《万方学位论文数据库》 * |
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Application publication date: 20170825 |